Ternary composites for glycerol conversion: The influence of structural and textural properties on catalytic activity

Mesoporous catalysts for dry reforming of methane: Correlation between structure and deactivation behaviour of Ni-containing catalysts

“…NCA has a methane conversion of 69% in the steady state condition (Fig. 4a) probably due to the well known properties of CeO 2 in promoting the redox reversibility of store, release and transport oxygen [6,18,26]. Consequently, it is reasonable to consider that the ceria would favour the coke gasification by reacting with the surface carbon species formed on the Ni crystallites to produce CO restoring the Ni surface [24,29,30].…”

“…Over solegel obtained solids, NiO disperses uniformly in the ZrO 2 eAl 2 O 3 carrier and not all diffraction peaks of NiO appear due to the limit of instrument sensitivity [1,11]. XRD pattern of NCA shows the characteristic diffraction lines of cubic Fm 3 m CeO 2 fluorite structure at 2q ¼ 33.1, 47.7 and 56.8 [18] whereas those at 39.7 and 66.6 , consisted of only broad peaks attributed to g-Al 2 O 3 due to the formation of solid solution between Al 2 O 3 and CeO 2 , namely cubic CeAlO 3 [19], in addition to that of NiO at 43.4 and 74.6 . Moreover, the peak at about 35 (011) corresponds to the hexagonal Ce 2 O 3 .…”

“…This is further confirmed by XRD results. Over NCA, a strong peak located at about 462 cm À1 is ascribed to the F2g Raman active mode of the fluorite structure [6] whereas the weak mode 620 cm À1 suggests the distortion of oxygen lattice caused by the presence of other phases [18] and this indicates that CeO 2 and CeAlO 3 remains oxidized after the catalytic test due to the following reactions:…”

Continuous Flow Upgrading of Selected C2–C6Platform Chemicals Derived from Biomass

“…In some examples, molecular hydrogen was co-fed with glycerol. Co-feeding hydrogen promoted the dehydration reaction and inhibited the formation of coke, thus preventing catalyst deactivation. , Silver-, aluminum-, cerium-, ,− chromium-, copper-, ,,− and lanthanum- , as well as cobalt- and ruthenium-based catalysts were reported as efficient heterogeneous catalysts for the reaction. The most relevant catalysts and optimized conditions for hydroxyacetone formation are summarized in Table .…”